如何在try catch语句的帮助下制作一个循环，命令用户继续输入值，直到满足条件为止？

import java.util.Scanner;

public class PersonTidbok {
    public static void main(String[] argv) {
        Scanner console = new Scanner(System.in);
        boolean valid;
        char choice = '\0';
        String persnr;
        do {
            valid = true;
            System.out.print("Welcome to your interface, please select of the following (P, T, L, S, A, Q): ");
            String input = console.nextLine();
            if (input.length() != 1) {
                System.out.println("Invalid input. Try again.");
                valid = false;
            }
            choice = input.charAt(0);
        } while (!valid);

        switch (choice) {
        case 'P':
            do {
                valid = true;
                System.out.print("Enter persnr in the format of (YYYYMMDD): ");
                try {
                    persnr = console.nextLine();
                    if (!persnr.matches("[1-9]{1}[0-9]{7}")) {
                        throw new IllegalArgumentException("You printed wrong format, try again");
                    }
                    System.out.println("Processsing...");
                    // ...Processing of persnr should go here
                } catch (IllegalArgumentException e) {
                    System.out.println(e.getMessage());
                    valid = false;
                }
            } while (!valid);
            break;
        default:
            System.out.println("Wrong value for choice.");
        }
    }
}

运行示例：

Welcome to your interface, please select of the following (P, T, L, S, A, Q): a
Wrong value for choice.

另一个示例运行：

Welcome to your interface, please select of the following (P, T, L, S, A, Q): PT
Invalid input. Try again.
Welcome to your interface, please select of the following (P, T, L, S, A, Q): P
Enter persnr in the format of (YYYYMMDD): 01234567
You printed wrong format, try again
Enter persnr in the format of (YYYYMMDD): ancdefgh
You printed wrong format, try again
Enter persnr in the format of (YYYYMMDD): 20180912
Processsing...

回答来源：Stack Overflow